A full sky, low foreground, high resolution CMB map from WMAP

By Jacques Delabrouille, Jean-François Cardoso, Maude Le Jeune, Marc Betoule, Gilles Faÿ, Frédéric Guilloux. 2008

233 citations recorded by the source corpus.

Context. The WMAP satellite has made available high quality maps of the sky in five frequency bands ranging from 22 to 94 GHz, with the main scientific objective of studying the anisotropies of the Cosmic Microwave Background (CMB). These maps, however, contain a mixture of emission from various astrophysical origin, superimposed on CMB emission. Aims. The objective of the present work is to make a high resolution CMB map in which contamination by such galactic and extra-galactic foreground emissions, as well as by instrumental noise, is as low as possible. Methods. The method used is an implementation of a constrained linear combination of the channels with minimum error variance, and of Wiener filtering, on a frame of spherical wavelets called needlets, allowing localised filtering in both pixel space and harmonic space. Results. We obtain a low contamination low noise CMB map at the resolution of the WMAP W channel, which can be used for a range of scientific studies. We obtain also a Wiener-filtered version with minimal integrated error. Conclusions. The resulting CMB maps offer significantly better rejection of galactic foreground than previous CMB maps from WMAP data. They can be considered as the most precise full-sky CMB temperature maps to date.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/cc61e84abbe3b04f2d263dfed2cfc5eccc591405

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Oceanography

Citations in the corpus

CMB and SZ effect separation with constrained Internal Linear Combinations (2010, methodology): “…for foreground emission, has been extensively used in the analysis of the maps obtained by the Wilkinson Microwave Anisotropy Probe (WMAP) satellite to extract a CMB map (Bennett et al. 2003; Eriksen et al. 2004; Park, Park & Gott 2007; Kim, Naselsky & Christensen 2008; Delabrouille et al. 2009).”
PRISM (Polarized Radiation Imaging and Spectroscopy Mission): an extended white paper (2013, methodology): “ing applied to a small patch of sky, this implements an ILC that is localized in both pixel space and across scales, similar to the needlet LC method successfully used for CMB extraction on WMAP data [8,9,62]. Figure3illustrates the outcome of this processing. Several hundred clusters matching the i”
The pre-launch Planck Sky Model: a model of sky emission at submillimetre to centimetre wavelengths (2012, methodology): “In the current version of the model, we use the Wiener-filtered Needlet ILC (NILC5) map obtained from WMAP 5-year data by Delabrouille et al. (2009) as the standard CMB map at the resolution of the WMAP W-band channel.”
PICO: Probe of Inflation and Cosmic Origins (2019, methodology): “12Non-parametric techniques rely on the fact that CMB emission is uncorrelated with the foregrounds and thus a correlations analysis within a given spatial/frequency data-cube can be used to separate the two sources of emission [130, 227–230].”